Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b129cc76fd5289…

MALICIOUS

PDF

79.5 KB Created: 2021-03-23 22:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 97fedde1fac0090ec24de85d687f299b SHA-1: 8e2ec6d6fdb74f76410cf2408189e0649d272364 SHA-256: 20b129cc76fd52893b13eb06663329679f0a633f8cf12e80dff223b59c719204
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to a manual, which is likely a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/wix?keyword=schlage+camelot+be365+manual PDF link annotation
    • https://metifipiwe.weebly.com/uploads/1/3/1/1/131164131/6a8ef692709806b.pdfIn PDF document text
    • http://vasezasu.22web.org/98362121299.pdfIn PDF document text
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/fakebu.pdfIn PDF document text
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/7192486.pdfIn PDF document text
    • https://norobeso.weebly.com/uploads/1/3/4/5/134586389/wolerogapofa-ruzesireguzoxap-nizisirukeda-lufimiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_60167e12db96f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486772/normal_5fed79081f819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_603345c34c690.pdfIn PDF document text
    • http://gubuzikutavijuf.iblogger.org/maslow_hierarchy_of_needs_journal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424985/normal_5fe05cd23982c.pdfIn PDF document text
    • https://nadatipaj.weebly.com/uploads/1/3/5/3/135347779/sowuze_rumibudexajowak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387406/normal_5fcad878d583b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/biodata_format_for_job_interview_for_fresher.pdfIn PDF document text
    • http://wevevaviz.epizy.com/social_media_advertising_proposal.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/high_wizard_farming_guide_ragnarok_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0403cef-c69e-45e1-8c94-da73ab56b2c3/5445867231.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/mesemixixuwapedurosox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0acd5b-2175-4d23-93d7-f29b51681b2e/how_to_check_ink_level_epson_l3110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ceb840-f6d1-42ad-90de-843dba838566/rebelion_en_la_granja_resumen_pelicula.pdfIn PDF document text
    • http://kedogevakubonog.epizy.com/worksheets_esl_intermediate.pdfIn PDF document text
    • http://derekage.epizy.com/fomabebuxola.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 5624 bytes
SHA-256: b6a7eb7b9021d81ab7734cee1ad9fb11b73d5dcadcba9c57d910b463db349634
font_01_sfnt_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 12360 bytes
SHA-256: c087e89e7dac9687c0723d5400026e0a77502639ab459dd6cec93c3f648127fe
font_02_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 16396 bytes
SHA-256: 14f0539a8b0f28ada6197aa55dd25d29db5fa5273ada4efd2518527f2c11ccf7